<div>Thanks for the info Gregory,</div> <div> </div> <div>It does have an integrated ADC/ DAC, I will discuss the possibility with my instructors...</div> <div> </div> <div>By the way does anyone have the link for the spider project?</div> <div> </div> <div>Thanks</div> <div> </div> <div>Saad<BR><BR><B><I>Gregory Maxwell <gmaxwell@gmail.com></I></B> wrote:</div> <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">On Thu, Mar 13, 2008 at 3:00 PM, Saad Shakeel<BR><HYBRID.PARAMETER@YAHOO.COM>wrote:<BR>> Hi everyone,<BR>><BR>> Just got a SPARTAN 3-E FPGA..... and was wondering if i can implement the<BR>> some parts of the RONJA on it as well....<BR>> I came across the SPIDER project, which was implemented on a CPLD, but i'm<BR>> not sure if a CPLD code is compatible with an FPGA too?<BR><BR>If you have a DAC and ADC chips you could implement the pretty much a<BR>complete
signal chain... QAM (de)modulation on the FPGA, error<BR>correction, equalization, etc.<BR><BR>A ronja type device could consist of little more than:<BR><BR>[ethernet mac] - [fpga] - [dac] - [voltage to current amp] - [Tx LED]<BR>- [adc] - [preamp] - [RX sensor]<BR>- [small dac] / < AGC<BR><BR>A digital signal chain like this is, in my opinion, the most cost<BR>effective way to achieve speeds of 100mbit without switching to laser<BR>diodes.<BR><BR>QAM 16 would should be able to fit 100mbit into the (post<BR>equalization) bandpass or the LEDs being used for 10mbit ronja today,<BR>though I do not know what the SNR is like on real paths.<BR><BR>-- <BR>Twibright Ronja mailing list http://ronja.twibright.com<BR>Ronja@lists.pointless.net<BR>http://pointless.net/mailman/listinfo/ronja<BR></BLOCKQUOTE><BR><p> 
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